SALT AND WATER IN LIFE AND GROWTH 



139 



Fig. 48. Drawing of an Actinosphaerium according to Microscopic 



Observation 



Actinosphaerium eichhornii is a one-celled animal, usually about 1 mm. 

 in diameter, which frequently occurs among the leaves of water plants and 

 feeds on still smaller animals. It sends forth large numbers of stiff pro- 

 jections, as do certain other primitive animals. These creatures hold a 

 middle place between plants and animals. (Magnified 100 times.) 



Fig. 49. Artificial Osmotic Structure Resembling Actinosphaerium 



The resemblance of this structure is so striking that no further comment 

 is necessary. 



(Natural size.) (According to Leduc.) 



